The present study was carried out after the approval of "Dokuz Eylül University School of Medicine, Clinical Researches Ethics Committee and informed consents of the patients were obtained. A total of 90 normotensive and American Society of Anesthesiology (ASA) I-II patients at and over the age of 65 years undergoing elective non-cardiac surgery were enrolled in the study. The study was designed as a prospective, randomized, double-blind study. The patients were randomly (sealed envelope method) assigned to one of the following groups: